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lib: Make notmuch_database_get_directory return NULL if the directory is not found

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Using the new support from _notmuch_directory_create, this makes
notmuch_database_get_directory a read-only operation that simply
returns the directory object if it exists or NULL otherwise.  This
also means that notmuch_database_get_directory can work on read-only
databases.

This change breaks the directory mtime workaround in notmuch-new.c by
fixing the exact issue it was working around.  This permits mtime
update races to prevent scans of changed directories, which
non-deterministically breaks a few tests.  The next patch fixes this.
This commit is contained in:
Austin Clements 2012-05-18 00:13:37 -04:00 committed by David Bremner
parent 67ae2377a9
commit fe1ca14104
3 changed files with 7 additions and 13 deletions
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7
lib/database.cc
View file

@ -1328,12 +1328,9 @@ notmuch_database_get_directory (notmuch_database_t *notmuch,
return NOTMUCH_STATUS_NULL_POINTER;
*directory = NULL;
/* XXX Handle read-only databases properly */
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY)
return NOTMUCH_STATUS_READ_ONLY_DATABASE;
try {
*directory = _notmuch_directory_create (notmuch, path, NOTMUCH_FIND_CREATE, &status);
*directory = _notmuch_directory_create (notmuch, path,
NOTMUCH_FIND_LOOKUP, &status);
} catch (const Xapian::Error &error) {
fprintf (stderr, "A Xapian exception occurred getting directory: %s.\n",
error.get_msg().c_str());

3
lib/notmuch-private.h
View file

@ -148,6 +148,9 @@ typedef enum _notmuch_private_status {
/* Flags shared by various lookup functions. */
typedef enum _notmuch_find_flags {
/* Lookup without creating any documents. This is the default
* behavior. */
NOTMUCH_FIND_LOOKUP = 0,
/* If set, create the necessary document (or documents) if they
* are missing. Requires a read/write database. */
NOTMUCH_FIND_CREATE = 1<<0,

10
lib/notmuch.h
View file

@ -300,10 +300,8 @@ notmuch_database_end_atomic (notmuch_database_t *notmuch);
* (see notmuch_database_get_path), or else should be an absolute path
* with initial components that match the path of 'database'.
*
* Note: Currently this will create the directory object if it doesn't
* exist. In the future, when a directory object does not exist this
* will return NOTMUCH_STATUS_SUCCESS and set *directory to NULL.
* Callers should be prepared for this.
* If this directory object does not exist in the database, this
* returns NOTMUCH_STATUS_SUCCESS and sets *directory to NULL.
*
* Return value:
*
@ -313,10 +311,6 @@ notmuch_database_end_atomic (notmuch_database_t *notmuch);
*
* NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception occurred;
* directory not retrieved.
*
* NOTMUCH_STATUS_READ_ONLY_DATABASE: Database was opened in read-only
* mode so the directory cannot be created (this case will be
* removed in the future).
*/
notmuch_status_t
notmuch_database_get_directory (notmuch_database_t *database,